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超临界水氧化技术及其在废水处理中的应用 总被引:6,自引:0,他引:6
论述了超临界水及氧化法的特点、氧化机理,介绍了SCWO法工艺流程,并作了处理成本分析。着重阐述了SCWO法在废水处理中的应用,最后对其应用前景进行了展望。 相似文献
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A novel advanced oxidation process to degrade organic pollutants in wastewater: Microwave-activated persulfate oxidation 总被引:12,自引:1,他引:12
This article, for the first time, provides a novel advanced oxidation process based on sulfate radical (SO4
.??) to degrade organic
pollutants in wastewater: microwave (MW)-activated persulfate oxidation (APO) with or without active carbon (AC). Azo dye acid
Orange 7 (AO7) is used as a model compound to investigate the high reactivity of MW-APO. It is found that AO7 (up to 1000 mg/L) is
completely decolorized within 5–7 min under an 800 W MW furnace assisted-APO. In the presence of chloride ion (up to 0.50 mol/L),
the decolorization is still 100% completed, though delayed for about 1–2 min. Experiments are made to examine the enhancement by
AC. It is exciting to find that the 100% decolorization of AO7 (500 mg/L) is achieved within 3 min by MW-APO using 1.0 g/L AC as
catalyst, while the degradation e ciency maintains at 50% byMWenergy without persulfate after about 5 min. Besides the destruction
of visible light chromophore band of AO7 (484 nm), during MW-APO, two bands in the ultraviolet region (228 nm and 310 nm) are
rapidly broken down. The removal of COD is about 83%–95% for 500 mg/L AO7. SO4
.?? is identified with quenching studies using
specific alcohols. Both SO4
.?? and .OH could degrade AO7, but SO4
.?? plays the dominant role. In a word, MW-APO AC is a new
catalytic combustion technology for destruction of organic contamination even for high concentration. 相似文献
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Supercritical water oxidation of polyvinyl alcohol and desizing wastewater:Influence of NaOH on the organic decomposition 总被引:1,自引:0,他引:1
Jie Zhang Shuzhong Wang Yang Guo Donghai Xu Yanmeng Gong Xingying Tang 《环境科学学报(英文版)》2013,25(8):1583-1591
Polyvinyl alcohol is a refractory compound widely used in industry. Here we report supercritical water oxidation of polyvinyl alcohol solution and desizing wastewater with and without sodium hydroxide addition. However, it is difficult to implement complete degradation of organics even though polyvinyl alcohol can readily crack under supercritical water treatment. Sodium hydroxide had a significant catalytic effect during the supercritical water oxidation of polyvinyl alcohol. It appears that the OH ion participated in the C-C bond cleavage of polyvinyl alcohol molecules, the CO2-capture reaction and the neutralization of intermediate organic acids, promoting the overall reactions moving in the forward direction. Acetaldehyde was a typical intermediate product during reaction. For supercritical water oxidation of desizing wastewater, a high destruction rate (98.25%) based on total organic carbon was achieved. In addition, cases where initial wastewater was alkaline were favorable for supercritical water oxidation treatment, but salt precipitation and blockage issues arising during the process need to be taken into account seriously. 相似文献
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有机氰废水的处理方法研究进展 总被引:2,自引:0,他引:2
有机氰废水处理是石油化工污染治理和控制的一个重要方面,国内有机氰废水的处理方法多为研究性的报道,工业化应用的方法不多,目前,国内外有机氰废水处理方法及其进展,着重介绍电解法,超临界水氧化法,并对研究发展方向提供几点意见。 相似文献